100% Polyester. The 3D is actually a mesh type material with the leafy stuff swen to that. This fact alone makes it very comfortable for early season since you get some air flow through the mesh. I guess the pattern holds up okay, but yes, I have noticed fading after less than a full year of use. I don't like that the leafy material is swen so close to the zippers...it's a bit*h to keep them out of the zipper. If I had not switched to Enigma, I would have done some trimming to fix this problem.
Don't get me wrong; I think that the ASAT pattern is awesome. I'm just not all that sold on the workmanship that has gone in to making the product.
Good luck with your choice.